package Expe6;

/**
 * @Author sy
 * @Date 2022/9/27
 */
public class Expe6T5 {
}
class Car{
    int fuelAmount;
    Car(int amount){
        fuelAmount = amount;
    }
}
class fuelTank{
    void run(Car car){
        car.fuelAmount = car.fuelAmount - 5;
    }
}
